Plug



FIG. 1 is a perspective view of a plug, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings are for the purpose of illustrating portions of the plug that form no part of the claimed design. 

CLAIM The ornamental design for a plug, as shown and described. 